On 9 May 1733 when Isaac was 53, he married Lydia Learnard in Pomfret, CT. Lydia died in Hampton, CT aft 19 Mar 1799.
Children of Isaac and Lydia (Leonard) Allyn, born at Pomfret:
i. John Allyn, b. 12 Dec 1734, d. 1 Aug 1776 at Pomfret;
ii. Mary Allyn, b. 13 Nov 1736;
iii. Jabez Allyn, b. 13 Apr 1738, d. 9 Dec 1803 at Brooklyn, CT;
iv. Isaac Allyn, b. 11 Sep 1740, d. soon;
v. Issac Allyn, b. 11 Feb 1741/42, m. at Killingly, CT, 30 Jan 1764 Amey Deane (b. 18 Feb 1745/6 at Plainfield, CT);
vi. Jonathan Allyn, b. 19 Sep 1743;
vii. Lydia Allyn, b. 19 Aug 1745, d. Jul 1778 in Pennsylvania;
viii. Hannah Allyn, b. 9 Aug 1747, d. 24 Jul 1790 at Brooklyn, CT;
ix. Thankful Allyn, b. 28 Mar 1750; and
x. Joseph Allyn, b. 10 Mar 1754.